EP0798010A1
Expired / Lapsed
EP
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Double tube, apparatus for producing double tube, balloon catheter produced by using double tube, and process for producing balloon catheter
Assignee: Zeon Corp
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Filing: 1995-12-11
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Granted: —
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Expires: 2015-12-11
Abstract
Abstract A double tube from which a balloon catheter having a high rigidity and a low fluid resistance can be easily produced by means of an extruder or the like, an apparatus for producing the double tube, a balloon catheter produced by using the double tube, and a process for producing the balloon catheter are provided. The double tube comprises an outer tube having a lumen extending from the far end to the proximal end, and an inner tube which is provided within the outer tube and has a lumen extending from the far end to the proximal end, wherein a long material in the strip form is provided as a connecting member which continuously connects the inner surface of the outer tube to the outer surface of the inner tube in the axial direction. A balloon catheter can be easily produced by using this double tube. An apparatus for producing a double tube is also provided which comprises a first extruding means for extruding a resin for forming an outer tube portion, a second extruding means for extruding a resin for forming an inner tube portion, and a die for forming tubes respectively from the extrudate from the first extruding means and the one from the second extruding means.
Inventors
- 👤 Keiichi Kawata
- 👤 Hidenobu Urata
- 👤 Tetsuo Toyokawa
- 👤 Kouichi Sakai
- 👤 Masaru Uchiyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 17:03
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/10; A61M25/1027; A61M25/1036; A61M25/0021; A61M25/0023; A61M25/0026; A61M2025/0034; A61M2025/1043; A61M2025/1061; A61M25/0029; A61M25/0043; A61M25/005; A61M25/0053
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
112 words
A double tube comprising an outer tube having a lumen extending from the distal end to the proximal end, an inner tube which is provided within said outer tube and has a lumen extending from the distal end to the proximal end, and a connecting member which continuously extends from the distal end to the proximal end so that a part of the inner surface of said outer tube can connect to a part of the outer surface of said inner tube, said connecting member being shaped to be able to separate the inner surface of the outer tube from the outer surface of the inner tube within separable distance without damage.
Claim 2
Dependent Claim
26 words
The double tube as set forth in claim 1, wherein said connecting member is a longitudinal member continued from the distal end to the proximal end.
Claim 3
Dependent Claim
30 words
The double tube as set forth in claim 1, wherein said connecting member comprising a longitudinal member has a notch portion continued along its longitudinal direction of the longitudinal member.
Claim 4
Dependent Claim
37 words
The double tube as set forth in claim 3, wherein said notch portion lies in the portion close to at least either the inner surface of the outer tube or the outer surface of the inner tube.
Claim 5
Dependent Claim
30 words
The double tube as set forth in claim 1, wherein the flexural rigidity of said outer tube is larger in the proximal end side than in the distal end side.
Claim 6
Dependent Claim
30 words
The double tube as set forth in claim 1, wherein the flexural rigidity of said inner tube is larger in the proximal end side than in the distal end side.
Claim 7
Dependent Claim
34 words
The double tube as set forth in claim 1, wherein each flexural rigidity of said outer tube and said inner tube is larger in the proximal end side than in the distal end side.
Claim 8
Dependent Claim
64 words
The double tube as set forth in claim 1, wherein either of said outer tube and said inner tube is comprised of a laminated layer tube which is layered with more than two kinds of material and the Young rate or the flexural rigidity of the laminated layer is formed to become smaller continuously from the proximal end portion to the distal end portion.
Claim 9
Dependent Claim
99 words
The double tube as set forth in claim 1, wherein at least either of said outer tube and said inner tube is a multi-layer tube formed by a layer comprised of a stiff material and a layer comprised of a soft material, the sectional area occupied by the layer with the stiff material is smaller than that occupied by the layer with the soft material in the distal end side and the sectional area occupied by the layer with the stiff material is larger than that occupied by the layer with the soft material in the proximal end side.
Claim 10
Dependent Claim
84 words
The double tube as set forth in claim 1, wherein said outer tube is comprised of a multi-layer tube comprised of an inside layer made of a stiff material and an outside layer made of a soft material, and the sectional area occupied by the inside layer is smaller than that occupied by the outside layer in the distal end side and the sectional area occupied by the inside layer is larger than that occupied by the outside layer in the proximal end side.
Claim 11
Dependent Claim
52 words
The double tube as set forth in claim 1, wherein at least either of said inner tube and said outer tube is comprised of a tube braided by a wire, a line density of the braided wire is made rough in the distal end portion and dense in the proximal end portion.
Claim 12
Dependent Claim
78 words
The double tube as set forth in claim 1, wherein at least either of said inner tube and said outer tube is comprised of a tube where soft material strip portions and stiff material strip portions extending in the strip form in the axial direction are alternately disposed in the circumferential direction, and the number of the soft material strip portions is made a lot in the distal end portion and a few in the proximal end portion.
Claim 13
Dependent Claim
80 words
The double tube as set forth in claim 1, wherein at least either of said inner tube and said outer tube is comprised of a tube where soft material strip portions and stiff material strip portions extending in the strip form in the axial direction are alternately disposed in the circumferential direction, and the width of the circumferential direction of the soft material strip portion is made long in the distal end portion and short in the proximal end portion.
Claim 14
Independent Claim
264 words
An apparatus for producing a double tube, comprising an extruding apparatus including a first extruding means for extruding a resin for forming an outer tube portion, a second extruding means for extruding a resin for forming an inner tube portion, and a die for forming into tubes respectively out of the resins extruded from said first extruding means and said second extruding means; in said die, being formed a first circular hole where the resin extruded from the first extruding means passes from the backward to the forward of the die and a second circular hole where the resin extruded from the second extruding means passes from the backward to the forward of the die; the second circular hole being arranged inside said first circular hole; from the forward outlet of either of said first circular hole and said second circular hole to the backward, a slit being formed in the inside hole wall of said first circular hole or in the outside hole wall of the second circular hole so that said slit forms a connecting member which continuously connects the resin for forming the inner tube portion to the resin for forming the outer tube portion; and said first extruding means being connected to said die so that the resin extruded from the first extruding means can pass from the backward to the forward through the first circular hole and said second extruding means being connected to said die so that the resin extruded from the second extruded means can pass from the backward to the forward through the second circular hole.
Claim 15
Dependent Claim
65 words
The apparatus for producing a double tube as set forth in claim 14, wherein in the range less than 10 mm from the forward outlet to the backward of either of said first circular hole and said second circular hole, a slit is formed in the inside hole wall of the first circular hole or in the outside hole wall of the second circular hole.
Claim 16
Dependent Claim
34 words
The apparatus for producing a double tube as set forth in claim 14 or 15, wherein said slit is formed so as to be positioned in the upper direction of the second circular hole.
Claim 17
Dependent Claim
199 words
A balloon catheter comprising a double tube and a balloon; said double tube comprising an outer tube having a lumen extending from the distal end to the proximal end, an inner tube which is provided within said outer tube and has a lumen extending from the distal end to the proximal end, and a connecting member which continuously extends from the distal end to the proximal end so that one portion of the inner surface of said outer tube can connect to one portion of the outer surface of said inner tube; said connecting member being shaped to enable to separate the inner surface of the outer tube from the outer surface of the inner tube within separable distance without damage; the length of said outer tube being shorter than that of said inner tube and the distal end of the inner tube being extended in the distal direction from the distal end of the outer tube; said balloon being formed by a cylindrical film; and the one end of the film being affixed to the distal end of the inner tube and the other end of the film being affixed to the distal end of the outer tube.
Claim 18
Dependent Claim
208 words
A process for producing a balloon catheter comprising the steps of cutting an outer tube of a double tube into a circular sliced portion at just the preferable distance from the distal end of the outer tube, the double tube being comprised of the outer tube having a lumen extending from the distal end to the proximal end, an inner tube which is provided within said outer tube and has a lumen extending from the distal end to the proximal end, and a connecting member continued from the distal end to the proximal end so that a part of an inner surface of said outer tube is connected to a part of an outer surface of said inner tube, separating a part of said outer tube from a part of said connecting member in a region from the distal end of the outer tube to said circular sliced portion, removing the part of said outer tube in the region from the distal end of said outer tube to said circular sliced portion, and affixing the one end of a cylindrical film as a balloon to said circular sliced portion of said outer tube and the other end of the film to the distal end of said inner tube.
References Cited (Backward Citations)
No citation records indexed.
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